A quick Google search for this reveals the typical kind of dress you’d see on Halloween or in Chinese shops: a tight fitted bodice, long skirt with a slit to the knee, usually in a brocade fabric with Chinese characters. However, this is what the CCP, or Chinese Communist Party, wants you to believe is traditional. More traditional clothing was flowy, with higher waists. Think empire waist dress meets ballgown without all the fluff of the skirt of the ballgown.
However, in modern day China, most people dress like you and I. Jeans and a tee-shirt are perfectly fine. Those who have religious garments might have a harder time legally wearing those, since the CCP’s stance on religion is not favorable, but that’s the only exception.